R1234YF SOĞUTUCU AKIŞKANI KULLANAN İÇ ISI DEĞİŞTİRİCİLİ BİR OTOMOBİL KLİMA SİSTEMİNİN PERFORMANSININ R134A’LI SİSTEM İLE KARŞILAŞTIRILMASI

Abstract

Bu çalışmada, termostatik genleşme valfli deneysel bir otomobil klima sisteminin R1234yf ve R134a soğutucu akışkanları kullanılması durumundaki çeşitli performans parametrelerinin değerleri belirlenmiş ve karşılaştırmalı olarak sunulmuştur. Masa üstü deney seti şeklinde kurulan sisteme, R1234yf ile çalışırken karşılaşılacak performans düşmesinin telafi edilmesi amacıyla emme ve sıvı hatları arasında ısı transferi sağlayan eş merkezli bir iç ısı değiştirici eklenmiştir. Isı değiştirici, sadece R1234yf testlerinin bir kısmında kullanılmıştır. Çevrimdeki soğutucu akışkan debisi ile çeşitli noktalardaki basınç ve sıcaklıkların sürekli rejim şartlarındaki değerleri ölçülmüştür. Ölçüm sonuçları kullanılarak çevrim bileşenlerinin enerji ve ekserji analizleri yapılmış, böylece çeşitli performans parametrelerinin değerleri akışkan ve ısı değiştirici kullanım durumuna göre belirlenerek birbirleri ile karşılaştırılmıştır. R1234yf’li sistemin evaporatör yükü, ısı değiştirici kullanılmaması ve kullanılması durumlarında R134a’lı sistemden ortalama olarak sırasıyla %12,9 ve %11,2 daha düşük bulunmuştur. Isı değiştiricisiz R1234yf’li sistemin STK değeri, R134a’lı sistemden ortalama %5,3 kadar daha küçük iken, ısı değiştiricinin devreye alınmasıyla STK iyileşmekte ve ortalama olarak sadece %2,5 daha küçük çıkmaktadır. Isı değiştiricisiz durumda R1234yf’li sistemin ekserjik verimi, R134a’lı klimadan ortalama %18,1 kadar daha küçük çıkmakta, ısı değiştirici devreye alındığında ise ekserjik verim ortalama % 6,1 daha düşük olmaktadır.

Keywords

• Klima
• İç ısı değiştirici
• Otomobil
• R1234yf
• R134a

Performance Comparison of an R1234yf Automobile Air Conditioning System using an Internal Heat Exchanger with R134a System

Abstract

In this study, various performance parameters of an experimental automobile air conditioning (AAC) system with a thermostatic expansion valve were evaluated for the cases of using R1234yf and R134a refrigerants and the results were presented comparatively. The system was set up as a desktop experimental set, and a concentric internal heat exchanger (IHX) providing heat transfer from the liquid to the suction line was added to compensate for the performance loss in R1234yf operations. The IHX was employed only in some R1234yf tests. The refrigerant flow rate, pressure and temperature measurements at various points were performed under steady-state conditions. Then, energy and exergy analyses were performed to determine the values of the performance merits. The evaporator load of the R1234yf system was on average 12,9% and 11,2% lower than the R134a one for the cases of not using and using the IHX, respectively. While the coefficient of performance (COP) of the R1234yf system without IHX was 5,3% less than that of the R134a one, COP was improved with the activation of IHX and became only 2,5% lower. The R1234yf system without IHX yielded 18,1% less exergetic efficiency than the R134a one, while it was 6,1% lower with active IHX.

Keywords

• Air conditioner
• Internal heat exchanger
• Automobile
• R1234yf
• R134a

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